Tag: hybrid solar-electric

Valerie Eacret for Zondits, June 21, 2015. Image credit: Picdream Variable refrigerant flow (VRF) systems can use substantially less energy to heat and cool a building than conventional HVAC systems. The technology uses a refrigerant, conditioned by an outdoor condensing unit, to deliver space heating and cooling to multiple fan-coil units throughout a building. Because […]

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